diff --git a/util/kconfig/lkc.h b/util/kconfig/lkc.h
index 590ed80..a7600bd 100644
--- a/util/kconfig/lkc.h
+++ b/util/kconfig/lkc.h
@@ -82,6 +82,9 @@
 int zconf_lineno(void);
 const char *zconf_curname(void);
 
+/* conf.c */
+extern int kconfig_warnings;
+
 /* confdata.c */
 const char *conf_get_configname(void);
 const char *conf_get_autoconfig_name(void);